はじめに
Ubuntu 20.04.4 LTS で PPPoE接続をします。
PPPoE接続に必要な ユーザ名 と パスワード を準備します。
外部から接続可能になると思いますので、ufw で Firewall の設定はしておきましょう。
- 20225ポートのみを開けたい場合
~$ sudo ufw enable
~$ sudo ufw allow 20225
~$ sudo ufw status verbose
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip
To Action From
-- ------ ----
20225 ALLOW IN Anywhere
20225 (v6) ALLOW IN Anywhere (v6)
環境
~$ uname -a
Linux ubuntu 5.4.0-121-generic #137-Ubuntu SMP Wed Jun 15 13:33:07 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.4 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.4 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
インストール
~$ sudo apt install pppoe pppoeconf
設定
- ダイアログ形式で設定を行う。
- ユーザ名とパスワード以外は全て YES でも良い。
- DNSを既存のものを使いたいなら、
USE PEER DNSを No にする - 起動時に自動接続されるので、嫌なら、
Your PPPD is configured now. Would you like to start the connection at boot time?を No にする。 - ダイアログに multi-modem などが表示されてうまくいかないときは、PPPoE接続先のみにネットワークケーブルを絞る。
~$ sudo pppoeconf
┌───────────────────┤ SCANNING DEVICE ├────────────────────┐
│ Looking for PPPoE Access Concentrator on enp1s0... │
│ │
│ │
│ │
│ │
│ │
│ 88% │
│ │
└──────────────────────────────────────────────────────────┘
┌─────────────────────────┤ OKAY TO MODIFY ├─────────────────────────┐
│ │
│ If you continue with this program, these configuration files will │
│ be modified : /etc/ppp/peers/dsl-provider /etc/network/interfaces │
│ and /etc/ppp/*-secrets. Please make sure that you have a backup │
│ copy before saying Yes. │
│ │
│ Continue with configuration? │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ <Yes> <No> │
└────────────────────────────────────────────────────────────────────┘
┌────────────────────────┤ POPULAR OPTIONS ├─────────────────────────┐
│ │
│ Most people using popular dialup providers prefer the options │
│ 'noauth' and 'defaultroute' in their configuration and remove the │
│ 'nodetach' option. Should I check your configuration file and │
│ change these settings where neccessary? │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ <Yes> <No> │
│ │
└────────────────────────────────────────────────────────────────────┘
┌────────────────────┤ ENTER USERNAME ├────────────────────┐
│ Please enter the username which you usually need for the │
│ PPP login to your provider in the input box below. If │
│ you wish to see the help screen, delete the username and │
│ press OK. │
│ │
│ username________________________________________________ │
│ │
│ │
│ │
│ │
│ │
│ <Ok> │
│ │
└──────────────────────────────────────────────────────────┘
┌────────────────────┤ ENTER PASSWORD ├────────────────────┐
│ Please enter the password which you usually need for the │
│ PPP login to your provider in the input box below. │
│ │
│ NOTE: you can see the password in plain text while │
│ typing. │
│ │
│ ________________________________________________________ │
│ │
│ │
│ │
│ │
│ <Ok> │
│ │
└──────────────────────────────────────────────────────────┘
┌─────────────────────┤ USE PEER DNS ├─────────────────────┐
│ │
│ You need at least one DNS IP address to resolve the │
│ normal host names. Normally your provider sends you │
│ addresses of useable servers when the connection is │
│ established. Would you like to add these addresses │
│ automatically to the list of nameservers in your local │
│ /etc/resolv.conf file? (recommended) │
│ │
│ │
│ │
│ │
│ <Yes> <No> │
│ │
└──────────────────────────────────────────────────────────┘
┌──────────────────────┤ LIMITED MSS PROBLEM ├───────────────────────┐
│ │
│ Many providers have routers that do not support TCP packets with a │
│ MSS higher than 1460. Usually, outgoing packets have this MSS when │
│ they go through one real Ethernet link with the default MTU size │
│ (1500). Unfortunately, if you are forwarding packets from other │
│ hosts (i.e. doing masquerading) the MSS may be increased depending │
│ on the packet size and the route to the client hosts, so your │
│ client machines won't be able to connect to some sites. There is a │
│ solution: the maximum MSS can be limited by pppoe. You can find │
│ more details about this issue in the pppoe documentation. │
│ │
│ Should pppoe clamp MSS at 1452 bytes? │
│ │
│ If unsure, say yes. │
│ │
│ (If you still get problems described above, try setting to 1412 in │
│ the dsl-provider file.) │
│ │
│ <Yes> <No> │
│ │
└────────────────────────────────────────────────────────────────────┘
┌─────────────────────────┤ DONE ├─────────────────────────┐
│ │
│ Your PPPD is configured now. Would you like to start the │
│ connection at boot time? │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ <Yes> <No> │
│ │
└──────────────────────────────────────────────────────────┘
┌────────────────┤ ESTABLISH A CONNECTION ├────────────────┐
│ │
│ Now, you can make a DSL connection with "pon │
│ dsl-provider" and terminate it with "poff". Would you │
│ like to start the connection now? │
│ │
│ │
│ │
│ │
│ │
│ │
│ │
│ <Yes> <No> │
│ │
└──────────────────────────────────────────────────────────┘
┌─────────────────┤ CONNECTION INITIATED ├─────────────────┐
│ │
│ The DSL connection has been triggered. You can use the │
│ "plog" command to see the status or "ip addr show ppp0" │
│ for general interface info. │
│ │
│ │
│ <Ok> │
│ │
└──────────────────────────────────────────────────────────┘
接続確認
設定直後から接続できている。
17: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1454 qdisc fq_codel state UNKNOWN group default qlen 3
link/ppp
inet XXX.XXX.XXX.XXX peer XXX.XXX.XXX.XXX/32 scope global ppp0
valid_lft forever preferred_lft forever
その他
-
PPPoEの設定ファイル
/etc/ppp/peers/dsl-provider -
PPPoEの手動切断
~$ poff dsl-provider
- PPPoEの手動接続
~$ pon dsl-provider
おわりに
かんたんでしたね